Re enable f8 x bf8 tests on compv3 and compv4 (#3605)

* Re-enable f8 x bf8 tests on CompV3 as they now pass

* On CompV4, fp8 x bf8 tests now pass with K_BlockSize I32

* Add a changelog entry

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Co-authored-by: Illia Silin <98187287+illsilin@users.noreply.github.com>